US7950359B2 - Variable valve system - Google Patents
Variable valve system Download PDFInfo
- Publication number
- US7950359B2 US7950359B2 US12/130,519 US13051908A US7950359B2 US 7950359 B2 US7950359 B2 US 7950359B2 US 13051908 A US13051908 A US 13051908A US 7950359 B2 US7950359 B2 US 7950359B2
- Authority
- US
- United States
- Prior art keywords
- variable valve
- cylinder
- cylinder deactivation
- valves
- operated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active, expires
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0005—Deactivating valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0203—Variable control of intake and exhaust valves
- F02D13/0207—Variable control of intake and exhaust valves changing valve lift or valve lift and timing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/06—Cutting-out cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L1/053—Camshafts overhead type
- F01L2001/0537—Double overhead camshafts [DOHC]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2800/00—Methods of operation using a variable valve timing mechanism
- F01L2800/06—Timing or lift different for valves of same cylinder
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to a variable valve system.
- VVL variable valve lift
- a variable valve timing portion is provided at one end of each of the intake camshaft and the exhaust camshaft. Cylinder deactivation portions are provided at some of the cylinders. One hydraulic pressure line is provided for the cylinder deactivation portions and another hydraulic pressure line is provided for the variable valve timing portions.
- a variable valve system includes a variable valve lifter for changing a first lift amount of one or more valves at a predetermined engine speed; a variable valve timing portion for controlling opening and closing timing of one or more valves; and a cylinder deactivation portion that changes a second lift amount of two or more valves in an alternating pattern.
- the variable valve lifter may control a rotation angle of a first control shaft to control a moving amount of a swing, arm, and/or control a rotation angle of a second control shaft to control a moving amount of a rocker arm.
- the first lift amount may be high, low, or medium.
- the second lift amount may be on or off.
- Two cylinder deactivation portions may be provided: a first one in a first cylinder, and a second one in a second cylinder.
- the system may alternately perform a first mode and a second mode. In the first mode, the first cylinder deactivation portion is operated, and the second is not. In the second mode, the first cylinder deactivation portion is not operated, and the second is.
- FIG. 1 is a first schematic diagram of a variable valve system according to an exemplary embodiment of the present invention.
- FIG. 2 is a second schematic diagram of a variable valve system according to an exemplary embodiment of the present invention.
- FIG. 3 is a third schematic diagram of a variable valve system according to an exemplary embodiment of the present invention.
- FIG. 4 is an arrangement table of a variable valve system according to an exemplary embodiment of the present invention.
- FIG. 5 is a drive mode arrangement table of a variable valve system according to an exemplary embodiment of the present invention.
- an engine 105 includes a first cylinder (cyl. # 1 ) a second cylinder (cyl. # 2 ), a third cylinder (cyl. # 3 ), and a fourth cylinder (cyl. # 4 ). Also, an exhaust camshaft 115 and an intake camshaft 120 arc disposed to the cylinders.
- a first cylinder deactivation portion 217 a for exhaust and a second cylinder deactivation portion 217 b for intake are provided in the first cylinder (cyl. # 1 ).
- a third cylinder deactivation portion 217 c for exhaust and a fourth cylinder deactivation portion 217 d for intake are provided the second cylinder (cyl. # 2 ).
- a fifth cylinder deactivation portion 217 e and a sixth cylinder deactivation portion 217 f are provided in the third cylinder (cyl. # 3 ).
- a seventh cylinder deactivation portion 217 g and an eighth cylinder deactivation portion 217 h are provided in the fourth cylinder (cyl. # 4 ).
- a first hydraulic pressure line is provided to cylinder deactivation portions 217 a to 217 h.
- a check valve 100 is provided in the first hydraulic pressure line.
- Control valves e.g., solenoid valves
- branch lines that are extended to the cylinder deactivation portions 217 a to 217 h.
- a variable valve timing portion 112 is disposed at one end of each camshaft 115 , 120 , and a second hydraulic pressure line is provided to the variable valve timing portions 112 .
- a control valve 110 is disposed in branch lines to each of the camshafts 115 and 120 .
- the deactivation portions 217 a to 217 h arc operated alternately. This prevents spark plugs disposed in any one particular cylinder from becoming fouled by oil. Also, bore transformation of a particular cylinder is prevented.
- a first variable valve lifter 405 a is provided in an exhaust port of the first cylinder (cyl. # 1 ) and a second variable valve lifter 405 b is provided in an intake port of the first cylinder (cyl. # 1 ).
- a third variable valve lifter 405 c and a fourth variable valve lifter 405 d are provided in the second cylinder (cyl. # 2 ).
- a fifth variable valve lifter 405 e and a sixth variable valve lifter 405 f are provided in the third cylinder (cyl. # 3 ).
- a seventh variable valve lifter 405 g and an eighth variable valve lifter 405 h are provided in the fourth cylinder (cyl. # 4 ).
- variable valve lifters 405 a to 405 h control a swing arm (not shown) so as to control a lift amount of the valve in FIG. 2 .
- the valve controlled by the swing arm is adjusted in three steps of high, low, or medium.
- a first control shaft 410 a and a second control shaft 410 b are provided so as to control the variable valve lifters 405 a to 405 h.
- the first control shaft 410 a is provided at the exhaust side adjacent to the exhaust camshaft 115
- the second control shaft 410 b is provided at the intake side adjacent to the intake camshaft 120 .
- Lifting distances of the exhaust valve and the intake valve are adjusted sequentially according to rotating positions of the first and second control shafts 410 a and 410 b.
- a third hydraulic pressure line is provided to the first and second control shafts 410 a and 410 b.
- a check valve 402 is provided in the third hydraulic pressure line.
- the first control shaft 410 a simultaneously controls valves of the exhaust side and the second control shaft 410 b simultaneously controls valves of the intake side.
- a first rotation angle control motor 400 a is provided at one end of the first control shaft 410 a, and a second rotation angle control motor 400 b is provided at one end of the second control shaft 410 b.
- a ninth variable valve lifter 505 a is provided in an exhaust port of the first cylinder (cyl. # 1 ), and a tenth variable valve lifter 505 b is provided in an intake port of the first cylinder (cyl. # 1 ).
- a eleventh variable valve lifter 505 c and a twelfth variable valve lifter 505 d are provided in the second cylinder (cyl. # 2 ).
- a thirteenth variable valve lifter 505 c and a fourteenth variable valve lifter 505 f are provided in the third cylinder (cyl. # 3 ).
- a fifteenth variable valve lifter 505 g and a sixteenth variable valve lifter 505 h are provided in the fourth cylinder (cyl. # 4 ).
- the ninth to sixteen variable valve lifters 505 a to 505 h control a rocker arm (not shown) so as to control a lift amount of a valve in FIG. 3 .
- the valve controlled by the rocker arm is adjusted in three steps of high, low, or medium.
- a third control shaft 510 a and a fourth control shaft 510 b are provided so as to control the variable valve lifters 505 a to 505 h.
- the third control shaft 510 a is provided at an exhaust side and adjacent to the exhaust camshaft 115
- the fourth control shaft 510 b is provided at an intake side and adjacent to the intake camshaft 120 .
- Lifting distances of the exhaust valve and the intake valve are adjusted continuously according to rotating positions of the third and fourth control shafts 510 a and 510 b.
- a fourth hydraulic pressure line is provided to the third and fourth control shafts 510 a and 510 b.
- a check valve 502 is provided in the fourth hydraulic pressure line.
- the third control shaft 510 a simultaneously controls valves of the exhaust side and the fourth control shaft 510 b simultaneously controls valves of the intake side.
- a third rotation angle control motor 500 a is provided at one end of the third control shaft 510 a, and a fourth rotation angle control motor 500 b is provided at one end of the fourth control shaft 510 a.
- an 14 engine has four cylinders (cyl. # 1 , 2 , 3 , 4 ), where the second and third cylinders (cyl. # 2 , 3 ) are classified into a first group, and the first and fourth cylinders (cyl. # 1 , 4 ) are classified into a second group.
- the first group and the second group are alternately deactivated in the 14 engine.
- variable valve lift system can be operated in different cylinders when cylinders are alternately deactivated.
- the variable valve lift system includes systems that are operated by a rocker arm or a swing arm.
- the first, third, and fifth cylinders (cyl, # 1 , 3 , 5 ) and the second, fourth, and sixth cylinders (cyl, # 2 , 4 , 6 ) are alternately deactivated in a V6 engine.
- the first, fourth, sixth, and seventh cylinders (cyl, # 1 , 4 , 6 , 7 ) and the second, third, fifth, and eighth cylinders (cyl, # 2 , 3 , 5 , 8 ) are alternately deactivated in a V8 engine.
- all cylinder deactivation portions (CDA) in group 1 and group 2 are operated in a fuel cut state.
- variable valve lifter (VVL) When the cylinder deactivation portions (CDA) in group 1 are operated in a range from 2000 to 3500 rpm, the variable valve lifter (VVL) can be operated in three steps of high, low, or medium in group 2 . Also, when cylinder deactivation portions (CDA) of group 2 are operated in a range from 2000 to 3500 rpm, the variable valve lifter (VVL) can be operated in three steps of high, low, or medium in group 1 . The variable valve lifters (VVL) of groups 1 and 2 are operated and the cylinder deactivation portions (CDA) of groups 1 and 2 are not operated from idle to 2000 rpm.
- variable valve lifter At full load, the variable valve lifter (VVL) is operated in medium at a low speed and the variable valve lifter (VVL) is operated in high at a high speed.
- the cylinder deactivation portion CDA does not operate at a full load.
Abstract
Description
Claims (3)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2007-0131664 | 2007-12-14 | ||
KR1020070131664A KR100947383B1 (en) | 2007-12-14 | 2007-12-14 | Variable valve system |
Publications (2)
Publication Number | Publication Date |
---|---|
US20090151673A1 US20090151673A1 (en) | 2009-06-18 |
US7950359B2 true US7950359B2 (en) | 2011-05-31 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/130,519 Active 2029-07-03 US7950359B2 (en) | 2007-12-14 | 2008-05-30 | Variable valve system |
Country Status (2)
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US (1) | US7950359B2 (en) |
KR (1) | KR100947383B1 (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130125844A1 (en) * | 2010-07-30 | 2013-05-23 | Wanhua Su | Self-adaptive hydraulic variable valve timing system for diesel engine and control method |
US8892330B2 (en) | 2011-10-17 | 2014-11-18 | Tula Technology, Inc. | Hybrid vehicle with cylinder deactivation |
US20150176444A1 (en) * | 2013-12-19 | 2015-06-25 | Hyundai Motor Company | Control apparatus of engine having variable valve lift apparatus and a method thereof |
US9239037B2 (en) | 2012-08-10 | 2016-01-19 | Tula Technology, Inc. | Split bank and multimode skip fire operation |
US9399964B2 (en) | 2014-11-10 | 2016-07-26 | Tula Technology, Inc. | Multi-level skip fire |
US9689327B2 (en) | 2008-07-11 | 2017-06-27 | Tula Technology, Inc. | Multi-level skip fire |
US10233796B2 (en) | 2014-05-12 | 2019-03-19 | Tula Technology, Inc. | Internal combustion engine using variable valve lift and skip fire control |
US10400691B2 (en) | 2013-10-09 | 2019-09-03 | Tula Technology, Inc. | Noise/vibration reduction control |
US10493836B2 (en) | 2018-02-12 | 2019-12-03 | Tula Technology, Inc. | Noise/vibration control using variable spring absorber |
US10662883B2 (en) | 2014-05-12 | 2020-05-26 | Tula Technology, Inc. | Internal combustion engine air charge control |
US11236689B2 (en) | 2014-03-13 | 2022-02-01 | Tula Technology, Inc. | Skip fire valve control |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9002624B2 (en) * | 2012-07-24 | 2015-04-07 | Ford Global Technologies, Llc | Variable valve timing for cylinder deactivation |
US8931444B2 (en) * | 2012-11-20 | 2015-01-13 | Ford Global Technologies, Llc | Head packaging for cylinder deactivation |
KR101619251B1 (en) | 2014-09-30 | 2016-05-10 | 현대자동차 주식회사 | Engine practicable cda |
KR101683492B1 (en) * | 2014-12-09 | 2016-12-07 | 현대자동차 주식회사 | Cylinder deactivation engine |
KR101704206B1 (en) * | 2015-06-02 | 2017-02-07 | 현대오트론 주식회사 | Method and apparatus for controlling cylinder deactivation pattern of engine |
CN106285828B (en) * | 2016-08-30 | 2019-01-22 | 重庆长安汽车股份有限公司 | A kind of automobile engine variable valve lift system oil channel structures |
KR101855771B1 (en) | 2016-11-07 | 2018-05-09 | 현대자동차 주식회사 | Cylinder deactivation engine and hydraulic pressure control method thereof |
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US6557518B1 (en) * | 2002-01-18 | 2003-05-06 | General Motors Corporation | Cylinder deactivation apparatus |
US20030226543A1 (en) * | 2002-06-10 | 2003-12-11 | Ford Global Technologies, Inc. | Vacuum management system on a variable displacement engine |
US6874463B1 (en) * | 2004-02-26 | 2005-04-05 | General Motors Corporation | Engine and method of operation with cylinder deactivation |
US20070215081A1 (en) * | 2006-03-14 | 2007-09-20 | Frincke Donn A | Cylinder deactivation apparatus incorporating a distributed accumulator |
US20080047509A1 (en) * | 2004-12-30 | 2008-02-28 | Delphi Technologies, Inc. | Method and apparatus for optimized combustion in an internal combustion engine utilizing homogeneous charge compression ignition and variable valve actuation |
US7765052B2 (en) * | 2007-12-05 | 2010-07-27 | Gm Global Technology Operations, Inc. | Variable active fuel management delay with hybrid start-stop |
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JPH02207151A (en) * | 1989-02-03 | 1990-08-16 | Honda Motor Co Ltd | Operating cylinder number variable engine |
JPH0633721A (en) * | 1992-07-16 | 1994-02-08 | Mitsubishi Motors Corp | Valve system for multiple cylinder internal combustion engine |
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Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
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US4129109A (en) * | 1976-08-12 | 1978-12-12 | Nissan Motor Company, Limited | Variable displacement internal combustion engine with means for switching deactivated cylinder groups at appropriate timing |
JPH0771278A (en) | 1993-08-31 | 1995-03-14 | Aisin Seiki Co Ltd | Valve timing controller of engine |
KR20000017311A (en) | 1998-08-17 | 2000-03-25 | 주르겐 헤르만 | Method for operating a multicylinder internal combustion engine and valve drive of a multicylinder internal combustion engine |
US6557518B1 (en) * | 2002-01-18 | 2003-05-06 | General Motors Corporation | Cylinder deactivation apparatus |
US20030226543A1 (en) * | 2002-06-10 | 2003-12-11 | Ford Global Technologies, Inc. | Vacuum management system on a variable displacement engine |
US6874463B1 (en) * | 2004-02-26 | 2005-04-05 | General Motors Corporation | Engine and method of operation with cylinder deactivation |
US20080047509A1 (en) * | 2004-12-30 | 2008-02-28 | Delphi Technologies, Inc. | Method and apparatus for optimized combustion in an internal combustion engine utilizing homogeneous charge compression ignition and variable valve actuation |
US20070215081A1 (en) * | 2006-03-14 | 2007-09-20 | Frincke Donn A | Cylinder deactivation apparatus incorporating a distributed accumulator |
US7765052B2 (en) * | 2007-12-05 | 2010-07-27 | Gm Global Technology Operations, Inc. | Variable active fuel management delay with hybrid start-stop |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9689327B2 (en) | 2008-07-11 | 2017-06-27 | Tula Technology, Inc. | Multi-level skip fire |
US20130125844A1 (en) * | 2010-07-30 | 2013-05-23 | Wanhua Su | Self-adaptive hydraulic variable valve timing system for diesel engine and control method |
US9163531B2 (en) * | 2010-07-30 | 2015-10-20 | Wanhua Su | Self-adaptive hydraulic variable valve timing system for diesel engine and control method |
US8892330B2 (en) | 2011-10-17 | 2014-11-18 | Tula Technology, Inc. | Hybrid vehicle with cylinder deactivation |
US9239037B2 (en) | 2012-08-10 | 2016-01-19 | Tula Technology, Inc. | Split bank and multimode skip fire operation |
US10400691B2 (en) | 2013-10-09 | 2019-09-03 | Tula Technology, Inc. | Noise/vibration reduction control |
US10634076B2 (en) | 2013-10-09 | 2020-04-28 | Tula Technology, Inc. | Noise/vibration reduction control |
US20150176444A1 (en) * | 2013-12-19 | 2015-06-25 | Hyundai Motor Company | Control apparatus of engine having variable valve lift apparatus and a method thereof |
US9476331B2 (en) * | 2013-12-19 | 2016-10-25 | Hyundai Motor Company | Control apparatus of engine having variable valve lift apparatus and a method thereof |
US11236689B2 (en) | 2014-03-13 | 2022-02-01 | Tula Technology, Inc. | Skip fire valve control |
US10233796B2 (en) | 2014-05-12 | 2019-03-19 | Tula Technology, Inc. | Internal combustion engine using variable valve lift and skip fire control |
US10662883B2 (en) | 2014-05-12 | 2020-05-26 | Tula Technology, Inc. | Internal combustion engine air charge control |
US9689328B2 (en) | 2014-11-10 | 2017-06-27 | Tula Technology, Inc. | Multi-level skip fire |
US9399964B2 (en) | 2014-11-10 | 2016-07-26 | Tula Technology, Inc. | Multi-level skip fire |
US10072592B2 (en) | 2014-11-10 | 2018-09-11 | Tula Technology, Inc. | Multi-level skip fire |
US9476373B2 (en) | 2014-11-10 | 2016-10-25 | Tula Technology, Inc. | Multi-level skip fire |
US10557427B2 (en) | 2014-11-10 | 2020-02-11 | Tula Technology, Inc. | Multi-level firing engine control |
US10837382B2 (en) | 2014-11-10 | 2020-11-17 | Tula Technology, Inc. | Multi-level firing engine control |
US10493836B2 (en) | 2018-02-12 | 2019-12-03 | Tula Technology, Inc. | Noise/vibration control using variable spring absorber |
Also Published As
Publication number | Publication date |
---|---|
US20090151673A1 (en) | 2009-06-18 |
KR100947383B1 (en) | 2010-03-15 |
KR20090064099A (en) | 2009-06-18 |
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